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Long-Term Debt - Valhi Contran Credit Facility - Additional Information (Detail) - VALHI, INC. - Contran Credit Facility
$ in Millions
9 Months Ended
Sep. 30, 2023
USD ($)
Debt Instrument [Line Items]  
Borrowings of credit facility $ 0.0
Repayments of credit facility $ 23.7
Debt instrument, Interest rate during period 9.09%
Debt instrument, Interest rate at period end 9.50%
Line of credit maximum borrowing capacity $ 77.3